Does it make sense to replace a smartphone's battery instead of buying a new one?After four years, my Redmi 4 smartphone's battery is slowly retiring looks like. It suddenly goes off even after fully charging it, sometimes even within 15-20 mins. of charging. It also sometimes goes off when there is an incoming call. I was wondering whether it makes sense to simply purchase a new battery for it rather than buy a new smartphone. The online Republic Day sales of Amazon and Flipkart are coming up so am debating about buying the battery/buying a new phone. Also, is it reliable to purchase a new battery online?
Have any of you ever replaced the phone battery and continued using the same phone for a few more years? Would the new battery last for another two to three years? Do share your own experiences, if any, of buying a new battery.
Further, if you bought a new phone, did you get an exchange value for it or did you pass on your old phone if in working condition to somebody else?
Note- I am posting this in the forum and not in the Ask Expert section for a broader discussion on battery replacements vs new phone purchase if the old phone is otherwise a good one.